[Exim] retry configuration for exim-3.36

Hi All,

I am just doing some fine tuning for our mail system and wondering if our
retry configuration is correct.
Below is what is currently set to, which I am pretty sure is the default for
exim. We run a very large site on exim-3.36
Our /var/spool/mail/input is 16GB and doesn't fluctuate that much, only
slighty. I have graphs of it's size from mrtg

Also whats the best way to run exim and its queue daemon? Currently we're
doing /usr/sbin/sendmail -bd -q1h
Is it better to do /usr/sbin/sendmail -bd and then do a seperate
/usr/sbin/sendmail -q1h or is it better to just combine them both.
Should we be using a lower -qx (minute or hour) setting? Someone mentioned
15m, is too much for our site?

I have also considering using another server for all outgoing mail, so in
theory instead of mailing waiting in /var/spool/input it goes via another
server and sits in the queue on that server.
Are there any associated nasties with doing this? No hosts or sites will
refuse my emails or anything wierd because the sending host isn't listed as
an MX?

Any ideas/comments would be great, thanks

Exim statistics from 2004-01-13 03:01:18 to 2004-01-14 03:01:21

Grand total summary
-------------------
                                                       At least one address
  TOTAL               Volume    Messages    Hosts      Delayed       Failed
  Received              20GB      543163     48651   59840 11.0%  71048
13.1%
  Delivered             19GB      487914     5522

Deliveries by transport
-----------------------
                      Volume    Messages
  local_delivery      3886KB         666
  remote_smtp         1046MB       40524
  spam_transport       394KB          34
  virtual_delivery      17GB      446690

######################################################################
#                      RETRY CONFIGURATION                           #
######################################################################

# This single retry rule applies to all domains and all errors. It specifies
# retries every 15 minutes for 2 hours, then increasing retry intervals,
# starting at 1 hour and increasing each time by a factor of 1.5, up to 16
# hours, then retries every 8 hours until 4 days have passed since the first
# failed delivery.

# Domain                Error           Retries
# ------                -----           -------
*                       quota_7d
*                       quota           F,2h,15m; F,3d,1h
*                       quota_7d
*                       quota           F,2h,15m; F,3d,1h
#*                      *               F,2h,15m; G,16h,1h,1.5; F,4d,8h
*                       *               F,2h,15m; F,4d,8h